GHS Strings DYM Guitar Boomers, Nickel-Plated Electric Guitar Strings, Wound G, Medium (.013-.056) Model: DYM Featuring the air-tight Fresh Pack & NitroPack singles, guaranteed fresh from the factory! Roundwound Nickel-Plated Steel on a Hex Core with a Wound Third Offers a brilliant tone and powerful attack, THE POWER STRING. Medium Gauge: 013-017-026-036-044-056